DJI Osmo Flex Arm
The trick is, you need the microphone on the right side, but the 1/4-20 mount is on the left side. If you mount the mic to the left you get a ton of cable stretch that stresses the gimbal motors, depletes your battery, and gets in the way. You can also mount small lights (that aren't too heavy) to the cold shoe.
The shoe is machined from a solid block of Delrin thermoplastic. The arm is an industrial product from Loc-Line. It's commonly used in machine tools and other industrial applications. The material is chemically resistant to petroleum products, coolants, and most common chemicals. It's quite expensive but it will take whatever you can throw at it.
The DJI Osmo Flex Arm is the perfect way to mount your accessory microphone! I searched for days trying to find a microphone mount that actually let me position the mic where ever I wanted it and came up dry. I found a lot of Youtube videos about how to hack something together; no good. I tried a bunch of aftermarket mounts and none of them worked well. So, out of frustration, I decided to make my own!
Where it's made